[jboss-jira] [JBoss JIRA] (WFLY-1416) Cross site replication requires totally connected graph of sites/routes

Wed May 29 12:32:54 EDT 2013

    [ https://issues.jboss.org/browse/WFLY-1416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777931#comment-12777931 ] 

Richard Achmatowicz commented on WFLY-1416:
-------------------------------------------

The results of running probe.sh on the second example above:

{noformat}
[nrla at lenovo bin]$ ./probe.sh -addr 224.0.75.75 op=RELAY2.printRoutes

-- send probe on /224.0.75.75:7500

#1 (235 bytes):
local_addr=SFO-0/web [b6c19793-46f8-1896-139c-4951cece8f15]
cluster=web
RELAY2.printRoutes=LON --> _LON-0/web:LON [UP]
SFO --> _SFO-0/web:SFO [UP]

physical_addr=127.0.0.1:55500
view=[SFO-0/web|0] [SFO-0/web]
version=3.3.0.Final

#2 (235 bytes):
local_addr=NYC-0/web [053e32af-c686-095a-e2ae-72daec24ea87]
cluster=web
RELAY2.printRoutes=LON --> _LON-0/web:LON [UP]
NYC --> _SFO-0/web:NYC [UP]

physical_addr=127.0.0.1:55400
view=[NYC-0/web|0] [NYC-0/web]
version=3.3.0.Final

#3 (261 bytes):
local_addr=LON-0/web [065795d7-1e4b-0f8a-438a-02d600684429]
cluster=web
RELAY2.printRoutes=LON --> _LON-0/web:LON [UP]
NYC --> _SFO-0/web:NYC [UP]
SFO --> [DOWN]

physical_addr=127.0.0.1:55200
view=[LON-0/web|1] [LON-0/web, LON-1/web]
version=3.3.0.Final

3 responses (3 matches, 0 non matches) 
{noformat}

> Cross site replication requires totally connected graph of sites/routes 
> ------------------------------------------------------------------------
>
>                 Key: WFLY-1416
>                 URL: https://issues.jboss.org/browse/WFLY-1416
>             Project: WildFly
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 8.0.0.Alpha2
>            Reporter: Richard Achmatowicz
>            Assignee: Paul Ferraro
>
> Cross site replication is configured using JGroups subsystem <relay/> and <remote-site/> elements to define sites and multicast relay routes between sites. 
> Looking at a site/route configuration as a graph of nodes and edges, xsite only works if this graph is totally connected (i.e. every site has a defined direct route to every other site). This is because <site name> -> <site id> mappings are assigned per node, with no agreement on what is happening at other nodes.
> For example, this configuration works:
> <relay site="LON">
>   <remote-site name="NYC" .../>
>   <remote-site name="SFO" .../>
> </relay>
> <relay site="NYC">
>   <remote-site name="LON" .../>
>   <remote-site name="SFO" .../>
> </relay>
> <relay site="SFO">
>   <remote-site name="NYC" .../>
>   <remote-site name="LON" .../>
> </relay>
> but this configuration does not:
> <relay site="LON">
>   <remote-site name="NYC" .../>
>   <remote-site name="SFO" .../>
> </relay>
> <relay site="NYC">
>   <remote-site name="LON" .../>
> </relay>
> <relay site="SFO">
>   <remote-site name="LON" .../>
> </relay>

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